In-lab calibration and testing of adaptive secondary mirrors using phase measuring deflectometry
In-lab calibration and testing of adaptive secondary mirrors using phase measuring deflectometry
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DOI：
10.1117/12.2627278
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Ruihan Zhang;M. Chun
中科院分区：
文献类型：
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作者：
Ruihan Zhang;M. Chun
一个自适应次镜（ASM）与新的致动器技术正在设计和建造的UH 88望远镜作为新一代的ASM，可能会部署在地面天文台，如凯克，斯巴鲁，和TMT的示范。在将ASM放在望远镜上之前，需要在实验室进行一系列校准和表征。ASM的关键实验室表征是测量其影响函数，以及通电和断电时的表面形状。为了测量这些，我们开发了一种新的和廉价的光学计量方法，使用相位测量偏转。本文介绍了我们编写的模拟模型的偏转法，我们的数据采集/分析管道，以及我们建立的实验室原型系统，证明其可行性的微机电系统（MEMS）变形镜。通过偏折术模拟和安装原型获得的信息的基础上，我们得出结论，相位测量偏折术是一种合理的方法，获得的影响函数，但绝对的表面形状的ASM将受到我们的知识的偏折术安装本身内的组件的位置。我们讨论的挑战，这种方法扩展到更大的凸自适应次镜。
An adaptive secondary mirror (ASM) with novel actuator technology is being designed and built for the UH88 telescope as a demonstration of a new generation of ASMs that might be deployed at ground based observatories such as Keck, Subaru, and TMT. Before putting the ASM on the telescope, a set of calibrations and characterizations need to be made in the lab. The crucial lab characterizations of the ASM are to measure its influence functions, and its surface shape when powered and unpowered. To measure these, we develop a novel and inexpensive optical metrology approach using phase measuring deflectometry. This paper describes the simulations we wrote to model the deflectometry method, our data acquisition/analysis pipeline, and a lab prototype system we built that demonstrates its feasibility on a microelectromechanical systems (MEMS) deformable mirror. Based on the information gained through the deflectometry simulation and the setup prototype, we conclude that phase measuring deflectometry is a reasonable method for obtaining the influence functions but that the absolute surface shape of the ASM will be limited by our knowledge of the placement of components within the deflectometry setup itself. We discuss challenges with extending this approach to larger convex adaptive secondary mirrors.